Fix grammar;

api/init.lua

@@ -6915,7 +6915,7 @@ return {
             },
             {
               name = "getAnimationNames",
-              summary = "Get the a table containing all animation names.",
+              summary = "Get a table containing all animation names.",
               description = "Returns a table containing the names of all animations supported by this Animator.",
               key = "Animator:getAnimationNames",
               module = "lovr.graphics",

api/lovr/graphics/Animator/getAnimationNames.lua

@@ -1,5 +1,5 @@
 return {
-  summary = 'Get the a table containing all animation names.',
+  summary = 'Get a table containing all animation names.',
   description = [[
     Returns a table containing the names of all animations supported by this Animator.
   ]],